Not the same effect exactly but I live in an 70s era apartment with heated ceilings in a couple rooms (which I didn’t even know was a thing).

It was a similar experience where initially it seemed great in the winter how quickly a room felt “warm”. But quickly you notice the air itself isn’t as warm which isn’t very pleasant and wait, I’m not feeling “warm” anymore I’m feeling “very hot”.

I basically gave up using them after the first winter except turned up sub-perceptually at like 25% just to add a bit of heat input to reduce the days where I need a space heater.

Interesting. The piece I read/heard didn't talk about using it instead of heating the house, but as a supplement to allow the whole-home temperature to be substantially lower.

Ah yeah that might work better. The one I read about was about having a giant magnetron in the basement, providing whole-house heating. Very 60's thing to try indeed.

This was probably 70s-80s. House heated to 10-15 C/50-60 F and microwave for comfort beyond that.